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Cocomania may be done at the U.S. Open. But McCoco is alive and well. Coco Gauff’s stunning singles run ended in tears with Saturday’s much-hyped loss to world-No. 1 Naomi Osaka. But the 15-year-old American phenom was all smiles and giggles while partnering with Caty McNally to reach the third round of women’s doubles. Gauff...